code: def test_reservation_environment_not_exists_get_server_ip_return_actual_host_ip(
      self,
  ):
      tfos_server = Server(5)
      assert tfos_server.get_server_ip() == util.get_ip_address()
  
file_path: TensorFlowOnSpark/tests/test_reservation.py
imports: import os
  import threading
  import time
  import unittest
  from tensorflowonspark import util
  from tensorflowonspark.reservation import Reservations, Server, Client
  from unittest import mock
label_desc: Use image node_id 4 for calling the ReservationTest obj's underlying member method code with example usage: obj.test_reservation_environment_not_exists_get_server_ip_return_actual_host_ip() without return types